If you're going it solo, on a tight budget, don't think you need us :) then this is especially for you. Matt Cutts of Google Webmasters fame talks about the 3 - 5 mistakes made by webmasters and those who prefer 'doing their own thing'.
SEO is an important facet of any website and a few critical mistakes are made by both webmaster and website owners/administrators. It takes some understanding, and you might need to know a little of what's under the hood, but it's fairly simple when once understand why. Obviously, we hope you don't have the time or manpower to even begin to understand the fundamentals of SEO and you'll ask us to help.